Mach 429 XTR BB

Hey fellow Pivot 429 owners. I ride in a mostly dry climate here in Arizona but I am currently on my 3rd XTR Shimano bottom bracket in my 2011 429. I don't power wash the damn thing but I just can't seem to keep them running smoothly. Lucky Shimano has replaced the other two under warrenty but I'm getting tired of this. Has anyone esle used a different (SRAM, Truavati) BB.